Unable to save lookup field data in SharePoint 2013 online list

Question

Dear Support,
I had successfully created provider hosted app and deployed on SharePoint 2013 online site, in my project I created orderservice.asmx.cs web service and write a code for save record on SharePoint
2013 online list as I mentioned below and calling on App1.js file.
But I am unable to save lookup field value as mentioned below code
Customer is a lookup field I want to save data in SharePoint 2013 online list( Order)where I had successfully
inserted text field  data (Title &
Special_x0020_Instruction).
i am getting error as mentioned below
500 Internal Server Error {"Message":"Invalid web service call, missing value for parameter: \u0027Title1\u0027.","StackTrace":"   at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2
parameters)\r\n   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData,
IDictionary`2 rawParams)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}
Please let me know the code how to insert lookup field value (Customer)
in SharePoint online list.
OrderService.asmx.cs
Public
int InsertOrder (Order
orderRecord)
            pwd.MakeReadOnly();
            clientContext.Credentials =
new
SharePointOnlineCredentials (myUserName, pwd);
try
              Web
oWeb = clientContext.Web;
ListCollection lists = oWeb.Lists;
List oOrderlist = clientContext.Web.Lists.GetByTitle("Order");
                clientContext.Load<ListCollection>(lists);
                clientContext.Load<List>(oOrderlist);
                ListItemCreationInformation
itemCreateInfo = new                 ListItemCreationInformation();
ListItem oListItem = oOrderlist.AddItem(itemCreateInfo);
                oListItem["Title"]
= Title;                        listItem["Special_x0020_Instruction"]
= orderRecord.Instruction;
                    listItem ["Customer"]
= orderRecord.CustomerId;
                    listItem.Update();
                    clientContext.ExecuteQuery();
return 1;
catch
return -1;
App1.JS
$("#Save").click(function
debugger;
var OrderProfile = $('#orderprofile').val();
var CustomerId = $('#exCustomerlist').jqxComboBox('getItem',
$('#exCustomerlist').val());
//var Instruction = $('#instruction').val();
        alert(OrderProfile);
        alert(CustomerId);
var obj = {
'Title': OrderProfile,
'Customer': CustomerId }
        $.ajax({
            url:
"OrderService.asmx/InsertOrder",
            type:
"POST",
            dataType:
"json",
            data: JSON.stringify(obj),
            contentType:
"application/json; charset=utf-8",
            beforeSend:
function (XMLHttpRequest) {
//Specifying this header ensures that the results will be returned as JSON.
                XMLHttpRequest.setRequestHeader("Accept",
"application/json");
            success:
function (response) {
                $(".errMsg ul").remove();
var myObject = response.d;
                alert(myObject);
            error:
function (response) {
                alert(response.status +
' ' + response.statusText +
' ' + response.responseText);
Regards,
Akhilesh

Answer 1

Hi Alex Brassington,
Thanks for your reply.
I am having the Site Administrator Permission of the public site.
I am having the permission of Company Administrator of that site but still unable to find
Device Channel on Site Setting. still I gave the user full control from Site Permission but nothing is happening.
What should I do next?